What was found
#3 ENGINE WOULD NOT START AFTER APU SHUTDOWN. STARTED OPERATING AND IGNITION LIGHTS ILLUMINATED BUT NO ENGINE ROTATION NOTED. MAINTENANCE FOUND OIL BYPASS PIN EXTENDED, AND MAIN CHIP DETECTOR CONTAMINATED, CONDITION 3. INSTALLED #3 ENGINE FERRY KIT IAW TASK CARD THREE ENGINE FERRY/ FLIGHT TO BE CONDUCTED IAW AVRO AFM APPENDIX 4. MAINTENANCE INSPECTED #3 STARTER SHAFT-VERIFIED SHEARED. FOUND ENGINE OIL BYPASS POPPED AND MAIN CHIP DETECTOR CONTAMINATED MSP MAINTENANCE REMOVED AND REPLACED #3 ENGINE IAW TASK CARD 7100-502.